diff --git a/adaptercore/device_handler_test.go b/adaptercore/device_handler_test.go
new file mode 100644
index 0000000..07d8704
--- /dev/null
+++ b/adaptercore/device_handler_test.go
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//Package adaptercore provides the utility for olt devices, flows and statistics
+package adaptercore
+
+import (
+	"net"
+	"testing"
+
+	"github.com/opencord/voltha-openolt-adapter/mocks"
+	"github.com/opencord/voltha-protos/go/voltha"
+)
+
+func newMockDeviceDeviceHandler() *DeviceHandler {
+	device := &voltha.Device{
+		Id:       "olt",
+		Root:     true,
+		ParentId: "logical_device",
+		Ports: []*voltha.Port{
+			{PortNo: 1, Label: "pon"},
+			{PortNo: 2, Label: "nni"},
+		},
+	}
+	return &DeviceHandler{
+		deviceID: device.GetId(),
+
+		device:       device,
+		coreProxy:    &mocks.MockCoreProxy{},
+		AdapterProxy: &mocks.MockAdapterProxy{},
+	}
+}
+
+func Test_generateMacFromHost(t *testing.T) {
+	type args struct {
+		host string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    string
+		wantErr bool
+	}{
+		{"test1", args{host: "localhost"}, "00:00:7f:00:00:01", false},
+		{"test2", args{host: "10.10.10.10"}, "00:00:0a:0a:0a:0a", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := generateMacFromHost(tt.args.host)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("generateMacFromHost() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("generateMacFromHost() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+func Test_macifyIP(t *testing.T) {
+	type args struct {
+		ip net.IP
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{{
+		"test1",
+		args{ip: net.ParseIP("10.10.10.10")},
+		"00:00:0a:0a:0a:0a",
+	},
+		{
+			"test3",
+			args{ip: net.ParseIP("127.0.0.1")},
+			"00:00:7f:00:00:01",
+		}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := macifyIP(tt.args.ip); got != tt.want {
+				t.Errorf("macifyIP() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestDeviceHandler_GetOfpDeviceInfo(t *testing.T) {
+	dh := newMockDeviceDeviceHandler()
+	device := &voltha.Device{}
+	got, err := dh.GetOfpDeviceInfo(device)
+	if err != nil {
+		t.Errorf("DeviceHandler.GetOfpDeviceInfo() error = %v", err)
+		return
+	}
+	t.Logf("ofpDeviceInfo %v", got)
+}
+
+func TestDeviceHandler_GetOfpPortInfo(t *testing.T) {
+	dh := newMockDeviceDeviceHandler()
+	device := &voltha.Device{}
+	got, err := dh.GetOfpPortInfo(device, 1)
+	if err != nil {
+		t.Errorf("DeviceHandler.GetOfpPortInfo() error = %v", err)
+		return
+	}
+	t.Logf("ofpDeviceInfo %v", got)
+}
+func TestDeviceHandler_GetChildDevice(t *testing.T) {
+	dh := newMockDeviceDeviceHandler()
+	type args struct {
+		parentPort uint32
+		onuID      uint32
+	}
+	tests := []struct {
+		name string
+		args args
+		want *voltha.Device
+	}{
+		{"test1",
+			args{parentPort: 1,
+				onuID: 1},
+			&voltha.Device{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := dh.GetChildDevice(tt.args.parentPort, tt.args.onuID)
+			t.Log("onu device id", got)
+		})
+	}
+}